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... seem strange. 2.64 B transistors indicates a Cayman die, but with only 512 stream processors? That's 2/3 deactivated. And FP64 deactivated. Why would they do this on a "professional" card, which is already being heavily castrated and, no doubt, quite expensive?

It is indeed a Cayman die with a ton of features disabled. The reason for it is that AMD needed a low power card with Cayman's FP64 capabilities and geometry throughput, which Juniper can't match. NVIDIA does something similar with the Quadro 2000.Reply

I rank Pro graphics cards in tiers based on price, as there is always a significant price jump between tiers. That being said, I would rank that V3900 in with the Quadro 600 despite the $50 price difference. Therefore I am hoping someone would run a test or 2 telling me if these cards are on par, or if you get some gain for the 600. I tend to lean towards nVidia with the CAD performance drivers based on personal experience, but I also like new and cheap.Reply

...pretty much unused on Ebay for £20 a few months later. After some corp has pulled them all out from their latest tech refresh or had to swap them out for the more expensive cards the CAD jockeys wanted in the first place.